单项选择题

A．Last year.
B．Two years ago.
C．Three years ago.
D．Early last year.
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单项选择题
A．Global warming.B．Human’’s actions.C．Industry pollution.D．Weather changes.
A．Global warming.
B．Human’’s actions.
C．Industry pollution.
D．Weather changes.
单项选择题
All Americans agree that hot dogs and hamburgers are their favorite foods.
A．Y
B．N
C．NG
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